It's been a weird one since this same thing seems to be affecting all the caching plugins leading me to believe this has to do with the last WP update and all the plugins have some common script patterns.
I did a thorough check with my server just to make sure, but after extensive testing, it's the caching plugins causing the issue.
Ironic that you have to keep clearing out the cache of the caching plugin to get it working properly. The fact that none of the caching plugin developers have really spoken of this definitely doesn't look good for a fix any time soon.